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AM-DSB-SC - v 1 t v 1 t A LPF-B 0 B(b Sketch the amplitude...

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The following block diagram (Fig.1-1) shows a communication system. For simplicity we assume that the signal is unchanged after the channel (no delay, no attenuation, no noise). Fig.1-1 The amplitude spectrum of the message signal, m (t), is shown in Fig.1-2 Fig. 1-2 (a) Sketch the amplitude spectrum of v 1 ( t ): | V 1 ( f )|; label important frequencies and amplitude values. 10 -10 f (Hz) |M(f)| 1 × Channel × mixer mixer cos(2000 п t) v 2 ( t ) v out ( t ) cos(2000 п t) m ( t ) Modulator Demodulator
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